/luby

ruby syntax + luajit performance & ffi

Primary LanguageLua

Build Status

luby

how it works

  • luby == (luajit + luajit bytecode files)
  • luajit bytecode files == (luajit_lang_toolkit + lua-compiled ruby files)
  • lua-compiled ruby files == (ruby_parser + sexp_processor)

how ruby-specified code converts

  • basic idea is last evaluate expression is value of if statement or block statement.
  • so move return or assignment to last evaluated expression.
a = b = c
=>
b = c
a = b

a = def f(x) p x end
=>
function f(x) print(x) end
a = nil # in ruby it actually be nil

a = if true then 1 else 2 end
=>
if true then a = 1 else a = 2 end

return if true then 1 else 2 end
=>
if true then return 1 else return 2 end

def fn
  "string"
end
=>
function fn()
  return "string"
end

class A
function gn()
   w + @x + @@y + Z
end
end
=> 
Object:const_set("A", class(Object, function (klass)
    klass:define_method("gn", function (self)
        return luby.lookup(self, "w") + self["@x"] + self.__class["@@y"] + self.__class:const_get("Z")
    end)
end))

how ruby state express in lua _G

_G 
 +- _R 
     +- class
         +- Object
         +- Array
         ...
     +- scope 
         +- 0
         +- 1
         +- 2
         ...
         +- N (global)